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t in (-oo:+oo)
4750-(25/2000) = t // - t
4750-t-(25/2000) = 0
4750-t-1/80 = 0
379999/80-t = 0 // - 379999/80
-t = -379999/80 // * -1
t = 379999/80
t = 379999/80
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